C) Periodization
Periodization is a useful tool in studying history because it helps to divide the time periods into distinctive blocks of time. We can use this to reference the culture or distinctive movements in society at the time.
Many of the European periods are named after a significant ruler or a dominant family from that time period. This is why you may hear someone reference the "Victorian", "Tudor", or "Edwardian" era.
I hope this helps, God bless, and have a great day!
Brainliest is always appreciated :)